Start seeds 4 or 5 weeks before last expected spring frost and again in midsummer for a fall crop. Sow seeds 1 inch apart in a container of seed starting mix, cover 1/2 inch deep and keep evenly moist. Provide a strong light source until seedlings are ready to plant out. When seedlings are 3 to 4 inches tall, gradually acclimate to outdoor conditions, then transplant 12 to 18 inches apart into rich, well-drained soil in full sun.
Broccoli needs rich, fertile soil and cool growing weather to produce big heads. Prepare soil well and do not let seedlings get too crowded before thinning or transplanting or the heads will be stunted. Keep well watered and weeded. Feed at least monthly with all purpose fertilizer. Use non-toxic B.T. (Bacillus thuringiensis) products to repel caterpillar pests as necessary.
HARVEST AND USE
Harvest the main head before florets open by cutting about halfway down the stalk. This will encourage numerous side shoots to form for extended picking from each plant.